公开(公告)号：DE69510509D1

公开(公告)日：1999-08-05

申请号：DE69510509

申请日：1995-08-23

Applicant: MATSUSHITA ELECTRIC IND CO LTD ,  MATSUSHITA REFRIGERATION

Inventor： DOYAMA YOSHIAKI ,  MATSUI KEIZO ,  ITO YOSHITERU ,  YOSHIOKA KANEHARU ,  OGATA HIDEO ,  YOSHIDA IZUMI ,  WATAKABE SHUSAKU

IPC: G01P3/48 ,  H02P23/08 ,  H02P5/408

Abstract: An inverter control apparatus for controlling a command frequency (f1) and a command voltage (V1) to be supplied to an inverter (2) which then supplies AC power of a desired frequency determined by the command frequency and the command voltage to an induction motor (1). The inverter control apparatus receives a requested rotational speed (fref) of the motor and an actual rotational speed (f') obtained by detecting a frequency of a fluctuation component of a drive current supplied from the inverter (2) to the induction motor (1). A difference between the requested rotational speed and the actual rotational speed represents a slip amount, which is added to the requested rotational speed to produce a command frequency. The command voltage is set to a voltage when the monitored drive current is at a minimum value.

公开(公告)号：DE69510509T2

公开(公告)日：2000-05-04

申请号：DE69510509

申请日：1995-08-23

Applicant: MATSUSHITA ELECTRIC IND CO LTD ,  MATSUSHITA REFRIGERATION

Inventor： DOYAMA YOSHIAKI ,  MATSUI KEIZO ,  ITO YOSHITERU ,  YOSHIOKA KANEHARU ,  OGATA HIDEO ,  YOSHIDA IZUMI ,  WATAKABE SHUSAKU

IPC: G01P3/48 ,  H02P23/08 ,  H02P5/408

Abstract: An inverter control apparatus for controlling a command frequency (f1) and a command voltage (V1) to be supplied to an inverter (2) which then supplies AC power of a desired frequency determined by the command frequency and the command voltage to an induction motor (1). The inverter control apparatus receives a requested rotational speed (fref) of the motor and an actual rotational speed (f') obtained by detecting a frequency of a fluctuation component of a drive current supplied from the inverter (2) to the induction motor (1). A difference between the requested rotational speed and the actual rotational speed represents a slip amount, which is added to the requested rotational speed to produce a command frequency. The command voltage is set to a voltage when the monitored drive current is at a minimum value.

公开(公告)号：JP2001174120A

公开(公告)日：2001-06-29

申请号：JP35432199

申请日：1999-12-14

Applicant: MATSUSHITA REFRIGERATION

Inventor： OGATA HIDEO ,  TOKUEI SHIGEOMI ,  ARAKAWA TOSHIKAZU ,  KITAGAWA HIROAKI ,  OKAMOTO YASUYUKI

IPC: F25D11/00

Abstract: PROBLEM TO BE SOLVED: To provide a vehicle-mounted refrigerator in which a battery can be prevented from dying even if the load current is varied by detecting overdischarge at a correct battery voltage even if the length of wiring is different among different types of vehicle. SOLUTION: A control means for preventing overdischarge 13 controls the temperature in the compartment by varying the voltage of a cooling means 8 comprising a thermoelectric element 5 depending on the temperature in the compartment and detects overdischarge of a battery 15 by detecting the input voltage through an input voltage detecting circuit 14. Since the input voltage is compensated by a voltage corresponding to the load current, overdischarge can be detected constantly with a correct battery voltage and the battery is protected against dying.

公开(公告)号：JPH10205895A

公开(公告)日：1998-08-04

申请号：JP1359797

申请日：1997-01-28

Applicant: MATSUSHITA REFRIGERATION

Inventor： KURIMOTO KAZUNORI ,  OGATA HIDEO ,  HAMAOKA KOJI ,  OGAWARA HIDEJI ,  KUBOTA YOSHITAKA ,  OGAWA KEIJI

IPC: F25B1/00

Abstract: PROBLEM TO BE SOLVED: To suppress stress and noise of a compressor by opening a valve for a short time to bring about pressure equilibrium while setting the time interval after stopping the compressor before delivering a start command within a set start waiting time before starting the compressor. SOLUTION: A freely opening/closing valve 6 is disposed at a position for bypassing the high pressure side of refrigeration cycle 5 to the low pressure side and a start waiting time setting means 12 sets a start waiting time required for starting a compressor 1 again without causing any lock after stopping thereof. A comparing means compares the start waiting time with a time interval immediately after stopping of the compressor before delivery of a stop command received from a timer count means 13. When the time interval is within the start waiting set time, the valve 6 is opened for a short time to bring about pressure equilibrium before starting the compressor 1.

公开(公告)号：JPH1023789A

公开(公告)日：1998-01-23

申请号：JP17474696

申请日：1996-07-04

Applicant: MATSUSHITA REFRIGERATION ,  MATSUSHITA ELECTRIC IND CO LTD

Inventor： YOSHIDA IZUMI ,  OGATA HIDEO ,  WATAKABE SHUSAKU ,  TSUCHIYAMA YOSHIRO ,  MATSUI KEIZO ,  ITO YOSHITERU ,  YOSHIOKA KANEHARU

IPC: F24F11/02 ,  H02M7/48 ,  H02P27/06 ,  H02P27/08 ,  H02P7/63

Abstract: PROBLEM TO BE SOLVED: To restrain hunting with high accuracy at a low cost, by detecting the fluctuation of a peak value from the outputted signal of a motor current detection part for checking if hunting occurs, and adjusting outputted voltage. SOLUTION: Hunting is detected by an AC part hunting discrimination part 4 from a motor current detection part 3 consisting of a current sensor for detecting motor current running through a compressor 2 and a change in current obtained by the motor current detection part 3. An output voltage command value is changed from the output of an AC part hunting discrimination part 4, and a PWM pulse is calculated to drive a reverse conveter 1. It is thus possible to restrain hunting with high accuracy at a low cost, by a simple method of detecting hunting easily with the current sensor and changing voltage.

公开(公告)号：JPH0951689A

公开(公告)日：1997-02-18

申请号：JP20310495

申请日：1995-08-09

Applicant: MATSUSHITA ELECTRIC IND CO LTD ,  MATSUSHITA REFRIGERATION

Inventor： TSUCHIYAMA YOSHIRO ,  MATSUI KEIZO ,  ITO YOSHITERU ,  YOSHIOKA KANEHARU ,  OGATA HIDEO ,  YOSHIDA IZUMI ,  WATAKABE SHUSAKU

IPC: F25B1/00 ,  H02P27/06 ,  H02P5/41

Abstract: PROBLEM TO BE SOLVED: To provide an efficient inverter controller for air-conditioning by minimizing power consumption without changing the speed of a compressor for air-conditioning. SOLUTION: The inverter controller of an air conditioner has a compressor for compressing a refrigerant by an induction motor 1 which is driven by an inverter 2 for varying a command voltage V1 and a command frequency f1 . It has a means 13 for detecting the pressure of the discharge refrigerant of the compressor, a means 15 for discriminating the frequency of the fluctuation constituent of the detected pressure, command frequency control means 7 and 8 for controlling the drive frequency so that it matches a target frequency by compensating the slide of the motor 1 based on the frequency which is discriminated by the discriminating means 15, and command voltage control means 9, 10, and 11 for including a minimization control means 11 for searching a command voltage so that a current value detected by the current detection means 3 gradually decreases.

公开(公告)号：JPH08261634A

公开(公告)日：1996-10-11

申请号：JP6615995

申请日：1995-03-24

Applicant: MATSUSHITA REFRIGERATION

Inventor： OGATA HIDEO ,  TSUJII YASUHIRO

IPC: F25D23/00

Abstract: PURPOSE: To obtain a refrigerator in which electric wiring is laid through a duct without increasing a draft resistance inside the duct and without being affected by electric noise, in regard to the refrigerator controlled by an electronic control circuit. CONSTITUTION: In regard to a duct 12 which is provided between a refrigerating chamber 7 and a freezing chamber 6 and through which cooled air passes and an electric wiring which connects a control base 14 provided in the refrigerating chamber 7 with a load and others located in the freezing chamber 6, two grooves are provided in separate places inside the duct 12 and AC wires 20 and DC wires 21 of the electric wiring are buried separately in the two grooves when they are laid through the duct 12.

公开(公告)号：JPH08247559A

公开(公告)日：1996-09-27

申请号：JP4702595

申请日：1995-03-07

Applicant: MATSUSHITA REFRIGERATION

Inventor： WATAKABE SHUSAKU ,  OGATA HIDEO ,  YOSHIDA IZUMI

IPC: F25B1/00

Abstract: PURPOSE: To enhance the efficiency of an air-conditioner by driving the air- conditioner with a voltage-frequency characteristic suitable to a load state with regards to an inverter device employed for the air-conditioner. CONSTITUTION: The enthalpy of workload of a compressor is determined by an enthalpy computing unit 19 based on compressor information obtained from a discharge pressure detector 15, a discharge temperature detector 16, a suction pressure detector 17, and a suction temperature detector 18. Based on the enthalpy thus obtained, a load torque is computed with a load torque estimating instrument 2. A wave shape memory device 12, which stores each of different voltage-frequency characteristic, determines a voltage-frequency characteristic with the torque load and outputs a wave shape signal to an inverter device 14, thereby constituting a wave shape generating device 13.

公开(公告)号：JP2506934B2

公开(公告)日：1996-06-12

申请号：JP11396288

申请日：1988-05-11

Applicant: MATSUSHITA REFRIGERATION

Inventor： HAGIMOTO TAKEO ,  OGATA HIDEO ,  ENDO KATSUMI

IPC: G07F11/70

公开(公告)号：JPH08154393A

公开(公告)日：1996-06-11

申请号：JP29332494

申请日：1994-11-28

Applicant: MATSUSHITA ELECTRIC IND CO LTD ,  MATSUSHITA REFRIGERATION

Inventor： TSUCHIYAMA YOSHIRO ,  MATSUI KEIZO ,  ITO YOSHITERU ,  YOSHIOKA KANEHARU ,  OGATA HIDEO ,  YOSHIDA IZUMI ,  WATAKABE SHUSAKU

IPC: H02P21/00 ,  H02P21/14 ,  H02P21/18 ,  H02P21/22 ,  H02P21/24 ,  H02P23/07 ,  H02P23/14 ,  H02P23/16 ,  H02P27/04 ,  H02P27/06 ,  H02P27/08 ,  H02P5/41 ,  H02P7/63

Abstract: PURPOSE: To provide an inverter control device which keeps a power consumption to the minimum without changing the number of revolutions of an induction motor and has a high efficiency. CONSTITUTION: A command voltage control means is installed and comprises a current detection means 3 which detects a current flowing to an induction motor 1 driven by an inverter having a variable command voltage and a variable command frequency and a minimization control means 11 which computes the torque current and the exciting current of the motor 1 on the basis of the phase difference of a voltage and a current by using an applied-voltage waveform, compensate a slip frequency component, computes the power consumption of the motor on the basis of the voltage and the current, and searches a command voltage in such a way that electric power becomes gradually small. Then, the power consumption is controlled minimum.